If the service is being supplied from a utility pole, the member is required to supply 1-10′ section of SCH 80 PVC and 2-10′ sections of SCH 40 PVC to be left near the base of the pole for installation by the power company up the pole.

Yes, There are three types. Overhead only, Underground only, and Overhead/Underground combination bases. However, combination boxes are not recommended for Underground installations because of their limited wire space.